/*
 * Copyright 2004 - 2013 Wayne Grant
 *           2013 - 2024 Kai Kramer
 *
 * This file is part of KeyStore Explorer.
 *
 * KeyStore Explorer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * KeyStore Explorer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with KeyStore Explorer.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kse.gui.dnd;

import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTargetDropEvent;
import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.swing.SwingUtilities;

import org.kse.gui.KseFrame;
import org.kse.gui.actions.ExamineFileAction;
import org.kse.gui.error.DError;

public class DroppedFileHandler {

    private DroppedFileHandler() {
    }

    public static void drop(DropTargetDropEvent evt, final KseFrame kseFrame) {
        evt.acceptDrop(DnDConstants.ACTION_MOVE);
        Transferable trans = evt.getTransferable();

        try {
            if (trans.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {

                @SuppressWarnings("unchecked") final List<File> droppedFiles = (List<File>) trans.getTransferData(
                        DataFlavor.javaFileListFlavor);

                // open files in new thread, so we can return quickly
                SwingUtilities.invokeLater(() -> openFiles(kseFrame, droppedFiles));

            }
        } catch (IOException | UnsupportedFlavorException e) {
            DError.displayError(kseFrame.getUnderlyingFrame(), e);
        }
    }

    public static void openFiles(KseFrame kseFrame, List<File> droppedFiles) {

        ExamineFileAction examineFileAction = new ExamineFileAction(kseFrame);

        for (File droppedFile : droppedFiles) {
            try {
                examineFileAction.openFile(droppedFile);
            } catch (Exception e) {
                DError.displayError(kseFrame.getUnderlyingFrame(), e);
            }
        }
    }
}
